a guy who acts like a baller until you get to know him and you find out he's a bucket.
julie:"girl i was talkin to mike then i found out he was a bucket."
shanon:"really? he always matched with the fresh kicks. i thought he was ballin."
julie:"i did too, but then i saw his car, and when he wore the same clothes the next week, he's a bucket."
julie and shanon:"UNDERCOVER BUCKET!"
A straight man who goes out and/or secretly has sex with men behind their girlfriends/wives back
My lax bro Kevis such an undercover brother, he stops by gay bars every night to hook up with dudes behind his girlfriend s back.